\begin{tabular}{l*{11}{c}}
\hline
                 &\multicolumn{1}{c}{Yr}&\multicolumn{1}{c}{Yr}&\multicolumn{1}{c}{Yr}&\multicolumn{1}{c}{Yr}&\multicolumn{1}{c}{Yr}&\multicolumn{1}{c}{Yr}&\multicolumn{1}{c}{Yr}&\multicolumn{1}{c}{Yr}&\multicolumn{1}{c}{Yr}&\multicolumn{1}{c}{Yr}&\multicolumn{1}{c}{Yr}&\multicolumn{1}{c}{Yr}\\         &\multicolumn{1}{c}{4}&\multicolumn{1}{c}{5}&\multicolumn{1}{c}{6}&\multicolumn{1}{c}{7}&\multicolumn{1}{c}{8}&\multicolumn{1}{c}{9}&\multicolumn{1}{c}{10}&\multicolumn{1}{c}{11}&\multicolumn{1}{c}{12}&\multicolumn{1}{c}{13}&\multicolumn{1}{c}{14}\\ \hline  \emph{Second stage}\\
Enrollment  &      -0.025   &      -0.035** &      -0.034*  &      -0.039** &      -0.038** &      -0.019   &      -0.011   &      -0.007   &      -0.004   &      -0.003   &      -0.006   \\
            &     (0.016)   &     (0.016)   &     (0.017)   &     (0.017)   &     (0.018)   &     (0.020)   &     (0.021)   &     (0.021)   &     (0.020)   &     (0.020)   &     (0.019)   \\
\hline
Controls    &         Yes   &         Yes   &         Yes   &         Yes   &         Yes   &         Yes   &         Yes   &         Yes   &         Yes   &         Yes   &         Yes   \\
F-stat      &         230   &         221   &         230   &         235   &         231   &         230   &         233   &         225   &         224   &         227   &         233   \\
N           &        3662   &        3637   &        3634   &        3619   &        3599   &        3573   &        3552   &        3521   &        3497   &        3452   &        3403   \\
Mean of Y   &       -0.02   &       -0.04   &       -0.05   &       -0.07   &       -0.08   &       -0.09   &       -0.10   &       -0.11   &       -0.12   &       -0.12   &       -0.13   \\
\hline
\end{tabular}
